Um, I hate to say this...
Cats are omnivores...
True, they never eat nuts berries etc, but next time you're watching animal planet, pay attention. They eat the stomachs of their prey first- including it's contents.
They get their vegetable matter that way.
Also, do you let them eat some of the bones?
I know, it's a huge no-no, but believe it or not, that's how they get their calcium in the wild.
Seems if you're going to go natural, you might as well go all the way instead of feeding actual "meat" and having to add supplements for the rest. :)
I'm willing to bet she exagerattes a bit, but here's a link I found.. http://www.catinfo.org/makingcatfood...rs_of_Dry_Food